Installed a (Ebay)Universal Fuel pressure regulator on my NA 944. the actual regulator works great engine idle coincides with pressure increase or decrease, but the Gauge is really wonky, only paid $16 for it. Going to change the Gauge for a better one after I return from my trip.
What I did:
I pulled the fuel rail, and tread tapped the the rail where the stock Regulator goes, I did this to revert back to stock for Smog reasons. if needed of course. after that I ran the fuel lines and shown in picture's. I added a picture of the Barb fitting that I purchased for $2.39 ^_^